Confirmation of variability

Additional observations have been made with a 200mm reflector. The data confirms the occurrence of eclipses.

Photometric data

We provide magnitude data in the tables below. All the images have been carefully checked prior to photometry based on the following criteria: (1) normal value of magnitude zero point, (2) sky background is uniform across the image, (3) air mass < 2.5, (4) stars are sharp and not elongated in the E-W direction, (5) for the 80mm refractor only: accuracy of astrometric reduction is better than 0.5 pixel.

For the 80mm refractor, three 10 sec exposures are taken. The magnitudes are measured on the median of the three images.

For the 200mm reflector, the exposure and number of images taken is changing. The magnitudes values are measured on each individual image. For each night, a median is taken over several consecutive measurements to obtain the final magnitudes reported in the table. The number of values used for the median is indicated in the table third column. If it is greater than 3 the data is very reliable. If only 1 image was used, the data is probably fine but we cannot guarantee it does not contain an error.

Dauban Survey (80mm F/7.5 refractor)

Julian date

CR magnitude

2456190.317062

14.059

2456195.345588

14.022

2456202.322965

14.271

2456205.303035

14.081

2456206.295166

14.072

2456209.271912

15.720

2456210.272409

14.012

2456213.258683

14.070

2456219.253722

14.041

2456225.250435

14.182

2456230.243113

13.992

2456250.227661

14.276

2456254.226433

14.152

2456261.228864

14.357

2456263.232604

14.103

2456271.222588

15.313

2456277.229680

13.989

2456288.227471

14.174

2456401.565533

14.072

2456461.377266

14.227

2456474.521863

14.000

2456501.367273

14.223

2456502.355136

14.273

2456513.525366

14.059

2456516.536847

14.365

2456523.343450

14.345

2456540.390011

13.984

2456549.487274

14.090

2456558.370408

14.075

2456566.360167

13.974

LX200 (200mm F/10 reflector)

Julian date

CR magnitude

number of imagesused for photometry

2456504.348978

14.134

15

2456504.391504

14.149

15

2456504.435337

14.172

15

2456504.479472

14.163

15

2456505.399551

14.117

3

2456505.419247

14.107

3

2456505.439305

14.103

3

2456505.459293

14.112

3

2456505.478734

14.135

3

2456506.351754

15.830

3

2456506.370332

16.277

3

2456506.389909

16.812

3

2456506.426006

16.804

3

2456507.351404

14.181

1

2456507.351800

14.078

1

2456507.352196

14.183

1

2456508.349702

14.181

3

2456508.368107

14.148

3

2456508.386322

14.138

3

2456508.404840

14.103

3

2456508.423238

14.151

3

2456509.356893

14.164

3

2456509.379213

14.122

3

2456509.396582

14.154

3

2456509.408222

14.170

2

2456510.338600

14.147

3

2456510.358618

14.128

3

2456513.344363

14.201

1

2456513.344764

14.147

1

2456513.345167

14.195

1

Period search

Eclipses have been observed at these dates:

Eclipse julian dates

2456209.271912

2456271.222588

2456506.426006

The smallest observed interval between two eclipses is 61.95 days, this is too large for a period search.